DOGAN NO, TUGCU CT. Energy Efficiency in Electricity Production: A Data Envelopment Analysis (DEA) Approach for the G-20 Countries. IJEEP [Internet]. 2014 Dec. 26 [cited 2024 May 5];5(1):246-52. Available from: https://www.econjournals.com/index.php/ijeep/article/view/1043